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[romprefix] Report a pessimistic runtime size estimate
PCI3.0 allows us to report a "runtime size" which can be smaller than the actual ROM size. On systems that support PMM our runtime size will be small (~2.5kB), which helps to conserve the limited option ROM space. However, there is no guarantee that the PMM allocation will succeed, and so we need to report the worst-case runtime size in the PCI header. Move the "shrunk ROM size" field from the PCI header to a new "iPXE ROM header", allowing it to be accessed by ROM-manipulation utilities such as disrom.pl. Reported-by: Anton D. Kachalov <mouse@yandex-team.ru> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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